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Question
117 + 9 = 117 + 10 - 1 = 127 - 1
Is the above expression is correct?
Options:
A .  True
B .  False
Answer: Option A
:
A
Yes it is correct.
9 can be written as 10 - 1
So 117 + 9 = 117 + 10 - 1
Again (117+ 10) = 127, so (117+ 10) - 1= 127 - 1

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